Effects of distance from cattle water developments on grassland birds. Fontaine, A., Kennedy, P., & Johnson, D. Journal of Range Management, 57(3):238–242, Graduate Degree Program in Ecology, Dept. of Fish. and Wildlife Biology, Colorado State University, Fort Collins, CO 80523, United States, 2004. abstract bibtex Many North American grassland bird populations appear to be declining, which may be due to changes in grazing regimes on their breeding areas. Establishment of water developments and confining cattle (Bos taurus L.) to small pastures often minimizes spatial heterogeneity of cattle forage consumption, which may lead to uniformity in vegetative structure. This increased uniformity may provide suitable habitat for some bird species but not others. We assessed how cattle use, vegetative structure, and bird population densities varied with increasing distance from water developments (0-800 m) on the Little Missouri National Grassland (LMNG) in North Dakota. Lark buntings (Calamospiza melancorys Stejneger), which are typically associated with low vegetative cover, decreased with increasing distance from water developments. Horned larks (Eremophila alpestris L.), also a low-cover associate, followed a similar but weaker trend. Densities of another low-cover associate as well as moderate- and high-cover associates were not related to distance from water. Vegetative height-density and litter depth increased by 50 and 112%, respectively, while cowpie cover and structural variability decreased by 51 and 24%, respectively, with distance from water. Confidence interval overlap was common among all measures, showing substantial variability among study sites. Our results indicate cattle use is higher closer to water developments, and this pattern may positively affect the densities of lark buntings and horned larks. The absence of density gradients in the other bird species may be due to the paucity of locations > 800 m from water on the LMNG.
@ARTICLE{Fontaine2004,
author = {Fontaine, A.L. and Kennedy, P.L. and Johnson, D.H.},
title = {Effects of distance from cattle water developments on grassland birds},
journal = {Journal of Range Management},
year = {2004},
volume = {57},
pages = {238--242},
number = {3},
abstract = {Many North American grassland bird populations appear to be declining,
which may be due to changes in grazing regimes on their breeding
areas. Establishment of water developments and confining cattle (Bos
taurus L.) to small pastures often minimizes spatial heterogeneity
of cattle forage consumption, which may lead to uniformity in vegetative
structure. This increased uniformity may provide suitable habitat
for some bird species but not others. We assessed how cattle use,
vegetative structure, and bird population densities varied with increasing
distance from water developments (0-800 m) on the Little Missouri
National Grassland (LMNG) in North Dakota. Lark buntings (Calamospiza
melancorys Stejneger), which are typically associated with low vegetative
cover, decreased with increasing distance from water developments.
Horned larks (Eremophila alpestris L.), also a low-cover associate,
followed a similar but weaker trend. Densities of another low-cover
associate as well as moderate- and high-cover associates were not
related to distance from water. Vegetative height-density and litter
depth increased by 50 and 112%, respectively, while cowpie cover
and structural variability decreased by 51 and 24%, respectively,
with distance from water. Confidence interval overlap was common
among all measures, showing substantial variability among study sites.
Our results indicate cattle use is higher closer to water developments,
and this pattern may positively affect the densities of lark buntings
and horned larks. The absence of density gradients in the other bird
species may be due to the paucity of locations > 800 m from water
on the LMNG.},
address = {Graduate Degree Program in Ecology, Dept. of Fish. and Wildlife Biology,
Colorado State University, Fort Collins, CO 80523, United States},
keywords = {Distance sampling, Livestock grazing, Mixed-grass prairie, North Dakota,
Wildlife},
owner = {eric},
subdatabase = {distance},
timestamp = {2006.11.05}
}
Downloads: 0
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Establishment of water developments and confining cattle (Bos taurus L.) to small pastures often minimizes spatial heterogeneity of cattle forage consumption, which may lead to uniformity in vegetative structure. This increased uniformity may provide suitable habitat for some bird species but not others. We assessed how cattle use, vegetative structure, and bird population densities varied with increasing distance from water developments (0-800 m) on the Little Missouri National Grassland (LMNG) in North Dakota. Lark buntings (Calamospiza melancorys Stejneger), which are typically associated with low vegetative cover, decreased with increasing distance from water developments. Horned larks (Eremophila alpestris L.), also a low-cover associate, followed a similar but weaker trend. Densities of another low-cover associate as well as moderate- and high-cover associates were not related to distance from water. Vegetative height-density and litter depth increased by 50 and 112%, respectively, while cowpie cover and structural variability decreased by 51 and 24%, respectively, with distance from water. Confidence interval overlap was common among all measures, showing substantial variability among study sites. Our results indicate cattle use is higher closer to water developments, and this pattern may positively affect the densities of lark buntings and horned larks. The absence of density gradients in the other bird species may be due to the paucity of locations > 800 m from water on the LMNG.","address":"Graduate Degree Program in Ecology, Dept. of Fish. and Wildlife Biology, Colorado State University, Fort Collins, CO 80523, United States","keywords":"Distance sampling, Livestock grazing, Mixed-grass prairie, North Dakota, Wildlife","owner":"eric","subdatabase":"distance","timestamp":"2006.11.05","bibtex":"@ARTICLE{Fontaine2004,\r\n author = {Fontaine, A.L. and Kennedy, P.L. and Johnson, D.H.},\r\n title = {Effects of distance from cattle water developments on grassland birds},\r\n journal = {Journal of Range Management},\r\n year = {2004},\r\n volume = {57},\r\n pages = {238--242},\r\n number = {3},\r\n abstract = {Many North American grassland bird populations appear to be declining,\r\n\twhich may be due to changes in grazing regimes on their breeding\r\n\tareas. Establishment of water developments and confining cattle (Bos\r\n\ttaurus L.) to small pastures often minimizes spatial heterogeneity\r\n\tof cattle forage consumption, which may lead to uniformity in vegetative\r\n\tstructure. This increased uniformity may provide suitable habitat\r\n\tfor some bird species but not others. We assessed how cattle use,\r\n\tvegetative structure, and bird population densities varied with increasing\r\n\tdistance from water developments (0-800 m) on the Little Missouri\r\n\tNational Grassland (LMNG) in North Dakota. Lark buntings (Calamospiza\r\n\tmelancorys Stejneger), which are typically associated with low vegetative\r\n\tcover, decreased with increasing distance from water developments.\r\n\tHorned larks (Eremophila alpestris L.), also a low-cover associate,\r\n\tfollowed a similar but weaker trend. Densities of another low-cover\r\n\tassociate as well as moderate- and high-cover associates were not\r\n\trelated to distance from water. 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